The method described in the patent application, RIM, which the company filed for consideration in 2006. The patent was issued in late February 2012.
The user is prompted to come up with a rhythm that he will be tapping your finger on the device. Recognize the impacts will be built into your accelerometer. Fixed number of strokes, their strength and the time interval between successive beats.
Hitting is offered at the back of the phone's index finger. According to the authors of the patent, while holding the device in hand, the greatest burden falls on the large, middle and ring fingers and little finger and the index is free.
Pat proposed to use a conditional knock instead of a text password to unlock the phone or in conjunction with it. This way, you can also protect individual applications.
Alternative ways to protect the password text mobile devices and other companies offer. So, Google has built into the operating system Android 4.0 feature Face Unlock (in Russian translation - "face control"). In this case, the identifier of the facial features are the user who recognizes the phone with a built-in camera.
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